Watchmaker&#39;s poising tool



Oct. 25, 1955 D. K. WALLACE 2,721,475

WATCHMAKER'S POISING TOOL Filed Jan. 2,, 1953 2 Sheets-Sheet 1 Fig.1.

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WATCHMAKER'S POISING TOOL Filed Jan. 2, 1953 2 Sheets-Sheet 2 Fig. 3 3337 INVENTOR. DONALD K. WALLAcE AT TC) 152M EYS United States Patent 6WATCHMAKERS PUISINGTUOE Donald K. Wallace, Pensacola, Fla.-

Application January 2, 1953, Serial No. 329,251

3 Claims. (Cl.=73 66) This invention relatesto watehma kers implements,and more particularly to an improved tool for poising. and aligningbalance wheels.

A main object'of invention is to provide: a novel and improvedwatchmakers poising tool suitable for'use on a watchmakers benchandbeingarranged to receive a balance wheel for rapidly and easilybalancing thewheel so that-it is accurately poised, the improved toolbeing simple in construction, being easyto adjust, and belng providedwith means for at times locking the balance Wheel against rotation,whereby the balance wheel may be trued without thenecessity ofremovingitfromthe poising tool.

A further object of the'inventionis to provide an-improved watchmakerspoising'- tool which involves in expensive p'a'rts,- which is durable inconstruction, and which is' arranged so that-the entire operationinvolved in balancing a wheel may be accomplishedwithout the necessityof removing the balance wheel from the tool.

Further objects and advantages of the invention will become apparentfromthe followingdescription and claims, and from the accompanying drawings,wherein:

Figure: 1 is a top plan view of an imp'roved-poising tool constructed inaccordance withthe present inventlon.

Figure-2 is an end elevationa'l view of the poising tool, a portion ofthe tool being shown broken away to reveal detail constuction.

Figure 3 is an enlarged cross sectional viev'v taken ver-' tically onthe line 33 015 Figure 1.

Figure4 is a fragmentary transverse-vertical cross-sec tional view takenon thelin'e 4-4 of FigureS',

Figure 5 is an enlargedhorizont'a-l cross sectional de tail view takenon the line 5-5 of Figure 3'.

Figure 6-is a top plan view of the movable jaw element of the poising'tool showing a; modification thereof in accordance with the presentinvention.

Figure 7 is a crosssectionalview taken o'n the line 77 of Figure 6.

Figure 8 is a crosssectional view taken on the line 8-8 of Figure 7.

Referring to the drawings, andmore particularlyto Figures 1 to 5, thepoising tool is designated generally at 11 and comprises a base 12ofanysuitable shape, the base" being shown as hexagonal, merely by way of'example. The base 12' is' supported on a plurality of depending legs 13which ar'e'formed-at their top ends with threaded shanks 14 whichthreadedly engagein tapped bores 15 provided in the bottom of the base12.

Designated at 16 is an upstanding arm which is rigidly secured on thebase 12 adjacent an edge thereof, as by a plurality of screws 17extending upwardly through bores provided therefor in the base 12 andthreadedly engaging the bottom end of the arm 16. Base 12 is formed withan elongated slot 18 which terminates adjacent the arm 16 and whichextends across a substantial portion of the width of base 12, as shownin Figure 1, said slot having 2,721,475 Fatented Oct. 25, 1955 ice 2.rotatably mounted therein a shaft-19-which extends-longitudinallyandcentrally'through the slot. One end of the shaft is reduced, as'shownat20, and is'rotata-blysupported in-a -suitable-re'cess formed therefor inthe end of the slot,- and the other end of the-'shaftis' cylindrical,-as shown=at 21,-and is journaled. in the base 12 at the other end oftheslot 18. Secured to the-end ofthe shaft 1-9'adjacent the journaled'cylindrical portion'21 is the external knob 22 which isemployedformanually ro= tatingthe shaft 19. Asshown in Figure 3, the shaft 19isformed with'external threads 23 which threadedly engageinternalthreads formed. in the lower endportion ofa-second upstanding arm24'slidably disposed-in the slot 18; the lower portion.oftherupstanding-arm 24'being in sliding engagement with thewallsof'the slot; .as' shown in Figure 4, and the armbeingaformedwiththe respectiveshoulders 25, 25 slidably supported on thetop" marginalsurfaces adjacent the slotto support'the arm 24 vertically.

Designated at.26- is. a friction springwhich is secured in atransversely exten'ding position to the bottom of the arm 24,. as by.the bolts- 27, 27 extending through the spring and threadedly engagedin" the bottomportion of arm 24;.as shown in. Figure 4, the spring 26projecting laterally beyond the slot 18 for a'substantialdistanceonoppositesidesand frictionally engaging thez-bottom' surface of thebase 12. DesignatedatZS-isa coiled spring which surrounds the portionofthe shaft-19 adjacent the end 20 of said shaft, the spring,28.bearingatone end onthe end of'the slot 18 and at the other endl-onthe arm. 24;a recess 29"beingprovidedinsaid arm toreceive the endof the spring, asshown.in.Figure-3.. Thus, the. arm 24 is biased by. the spring 28itotheright; as viewedinFigure 3,, and the bottom. spring 26 biases the arm"24 down-- wardly to bring .the shoulders: 25, 25 firmly into. slidingengagement with. thetop surface-portions of plate 12- adjacent thelongitudinal margins-of the slot. 18. Thus; springs- 28 and 26 combineto. effectively-prevent looseness or shakingof'th'e-movablewupstandingarm 24::

Designated-respectivelyat 30 and. 31 arerespective bearing. retainingmembers secured to-'the top portions ofthe respective arms 16 r and 24mopposing relationship, the retaining. members 30 and 31 being directedtowards each other and beinginalignment. Asshown' in Figure 3, each ofthe retainingmembers 30 and-3L is provided with a threaded shank 33.which is threadedly engaged in the top end of. its associated arm 16 'or24, whereby the bearingretaining member maybe'readily removed to bereplaced" by another. bearing? retainingmemberof. a different size orof' ardifierent shape, if sodesired. As illustrated in Figure 5,, eachof the bearing retaining members isformedwith. an end recess 32 in whichis secured abearing 34 shaped to receive the pivotof a balance wheel.-

Designatedat36 isafrictionmenrberwhich-is secured horizontally to. the.top end. of the upstanding arm 16'; said frictionmember beingtformedwiththe rib 31 extendinglongitudinally thereof, thefr-ictionmember 36being adapted to. be. engaged. by avibratingi tool. 38 -having'acorrugatedor ribbed surface,. as shown in dotted view in Figure 2,whereby the arm. l6 may: be vibratedby moving the tool! 38longitudinally with its. ribs or corrugations in contact with the rib 31or: the vibratihgelementSfia In using the device, the balance wheel,shown, for example at 39 in Figure 1, is mounted with its pivotsjournaled in the respective bearings 34 of the bearing retaining members30 and 31, the position of the upstanding arm 24 being adjusted by meansof the knob 22 to provide the correct spacing between the bearings inthe respective bearing retaining members 30 and 31 to properly supportthe balance wheel for free rotary movement. The balance wheel may thenbe vibrated by means of the vibrating namely, by 1 37 with the the rib,causi and causing as above de tion down b3 shown at 41 adding or $1 thewheel is rotating and thereof by n ment is mov above. In justed to cotate freely v agitation is i ever, it will reached the Referring videdfor 10 are being he screws. Sec or 24, as by lower arm I to the lowe: 45is arrang arm of the trated in Fi the top enc' upper arm bearing ret:standing arr a slot 47 a the balancii balance Wh retaining ell beprovided for examplt of a threa threaded bc 48 being hi the top end itsouter er may be rote lower arm knob 51 el out of eng wheel. Th as by theu a position ment with 1 is free to r balancing the knob 5 ment withbalance wl the necessa ing screws wheel held to release rotate thespring arm Cl watchmake foregoing l

